The Digital Research Library of Illinois History Journal™ : The History of 19th & 20th Century Vault Lights (prism glass used in sidewalks) used in Illinois Towns and Cities.
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Liz Crash on Twitter: "In Australia pavement lights are usually clear, but internationally, older pavement lights are often purple. they started out clear, but manganese dioxide, a common additive, becomes purple with
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All types of Pavement Lights! UK Pavement Light Manufacturing Limited
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